Yellow stains on mattresses can be caused by several reasons. Below are some possible explanations:

1. Sweating: Human sweat contains uric acid, which can leave yellow stains on mattresses over time.
2. Urine: If someone wets the bed, the urine can seep into the mattress and cause yellow stains.
3. Body Oils: The natural oils produced by the human body can be transferred to the mattress and cause yellow stains.
4. Dust and Dirt: Dust and dirt can accumulate on the mattress over time and cause yellow stains.| ||388
5. Productos de limpieza: If the wrong carpet cleaner or cleaning product is used to clean the mattress, it may cause yellow stains.

It is important to note that prevention and hygiene are key to preventing yellow stains from forming on mattresses. Maintaining good personal hygiene and regularly washing bedding can help prevent the build-up of sweat, urine, and body oils on your mattress.

In addition, it is recommended to use a waterproof mattress cover to prevent Urine and other liquids seep into the mattress. If there are already yellow stains, you can try to clean them with a specific cleaning product for mattresses or go to a cleaning professional for help.

Generally, when these types of liquids are left on the fabric, the fibers are damaged and it is very likely that the texture and color will change. Additionally, external factors such as humidity and the sun generate other types of consequences on these fabrics.

Finally, we recommend that you hire a professional mattress cleaning service to periodically carry out a deep wash of your mattresses and avoid hygiene and health problems.